A calibration method for broad-bandwidth cavity enhanced absorption spectroscopy performed with supercontinuum radiation

T. Laurila, I. S. Burns, J. Hult, J. H. Miller, C. F. Kaminski

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Abstract

An efficient calibration method has been developed for broad-bandwidth cavity enhanced absorption spectroscopy. The calibration is performed using phase shift cavity ring-down spectroscopy, which is conveniently implemented through use of an acousto-optic tunable filter (AOTF). The AOTF permits a narrowband portion of the SC spectrum to be scanned over the full high-reflectivity bandwidth of the cavity mirrors. After calibration the AOTF is switched off and broad-bandwidth CEAS can be performed with the same light source without any loss of alignment to the set-up. We demonstrate the merits of the method by probing transitions of oxygen molecules O-2 and collisional pairs of oxygen molecules (O-2)(2) in the visible spectral range.

Original languageEnglish
Pages (from-to)271-278
Number of pages8
JournalApplied Physics B: Lasers and Optics
Volume102
Issue number2
Early online date22 May 2010
DOIs
Publication statusPublished - Feb 2011

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Keywords

  • ring-down spectroscopyOSCOPY
  • diode-lasers
  • light

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